Troubleshooting Problems

Extreme hiss and microphonic V1 tube circuitry

Started by NeverAfter

Pages1 2

Replies: 19
Views: 11,046

May 06, 2016, 10:33:18 AM
by rnolan

MP2 suddenly noisy after a show

Started by SidecarJoeG

Replies: 13
Views: 10,827

May 10, 2014, 07:12:23 AM
by MarshallJMP

Microphonic type squealing

Started by Darth Infernus

Pages1 2

Replies: 18
Views: 10,446

May 18, 2015, 10:38:38 PM
by Darth Infernus

ADA mp1 - Solid States works only

Started by gg85

Pages1 2 3

Replies: 31
Views: 10,438

October 05, 2023, 11:42:29 PM
by rnolan

LED Issue MP1

Started by Mojave

Replies: 4
Views: 10,266

December 31, 2023, 12:47:45 PM
by Mojave

Microtube 200 with no output

Started by calan

Pages1 2

Replies: 15
Views: 10,265

October 30, 2015, 12:34:21 AM
by rnolan

Rack grounding?

Started by Georgeclooney0

Pages1 2

Replies: 29
Views: 9,428

December 04, 2018, 11:07:57 AM
by rabidgerry

MP-1 MIDI not working

Started by niksa

Replies: 11
Views: 9,350

January 10, 2021, 06:30:02 AM
by MarshallJMP

No lights, no display, no sound

Started by emunstar

Pages1 2

Replies: 25
Views: 9,241

March 04, 2020, 11:42:35 AM
by MarshallJMP

ADA MP-1 Extreme Restoration

Started by SteveFuzz

Replies: 14
Views: 9,188

March 09, 2017, 05:24:45 AM
by Iperfungus

Gain drop

Started by Richie_B

Pages1 2

Replies: 17
Views: 9,183

July 12, 2016, 07:22:55 AM
by MarshallJMP

MP1 v 1.38 no sound can someone help me out?

Started by Wormwoody

Pages1 2

Replies: 16
Views: 9,121

May 05, 2018, 10:06:19 AM
by Wormwoody

MP1 V2 (no top switch) All original excluding battery mod

Started by ScottGray

Pages1 2

Replies: 26
Views: 8,977

October 18, 2020, 11:03:11 AM
by MarshallJMP

Help with mp1 - low distortion and "sputtering"

Started by Cstecker

Replies: 13
Views: 8,937

February 27, 2017, 03:58:07 PM
by Harley Hexxe

Ah the joys of troubleshooting

Started by Dante

Replies: 14
Views: 8,763

December 14, 2016, 01:27:26 AM
by rnolan

MP-1 high pitch squeal

Started by kfowler8

Replies: 13
Views: 8,759

September 09, 2014, 01:13:59 PM
by kfowler8

MP-1- err 1 on startup

Started by tabascojunkie

Replies: 8
Views: 7,969

July 27, 2017, 03:50:00 AM
by MarshallJMP

Bass setting not saving

Started by revhed666

Replies: 14
Views: 7,827

March 31, 2014, 09:51:25 PM
by rnolan

4ohm Resistor Across C131 & D38 ?

Started by red2203stack

Pages1 2

Replies: 16
Views: 7,602

January 20, 2019, 04:36:13 PM
by red2203stack

Low Volume & Unpleasant Distortion in one output channel.

Started by Auntie Ada

Replies: 9
Views: 7,486

July 29, 2015, 02:26:50 PM
by MarshallJMP